Space Vector Pulse Width Modulation (SVPWM) method is an advanced, computation intensive PWM method and possibly the best among all the PWM techniques for variable frequency drive applications. The SVPWM is an alternative method for the determination of switching pulse width and their position. The major advantage of SVPWM stem from the fact that, there is a degree of freedom of space vector placement in a switching cycle. This feature improves the harmonic performance of this method. This... Topics: SVPWM, 7-Segment SVM, 5-Segment SVM, Two -Level Inverter, SIMULINK
Due to increasing industrialization quantity of waste water is increasing at alarming rate while compositions of such waste are being more and more complex. Disposal of such waste must follow suitable treatments so that qualities of effluent for disposal follow requisite standards. Such Standards for effluent are discussed and a case study for a beverage producing plant is reported. Topics: industrial waste, eco-friendly disposal, effluent standards, law enforcement, waste minimization.
A key element to the success of any organization is the ability to continuously improve its business process performance. Efficient Business Process Redesign (BPR) methodologies are needed to allow organizations to face the changing business conditions. For a long time, practices for BPR were done case-by-case and were based on the insights and knowledge of an expert to the organization. It can be argued that efficiency, however, can further be achieved with the support of automatic process... Topics: Process Mining, Business Process Redesign, Business Process Management
This paper presents a new soft-switched resonant dcdc converter using a passive snubber circuit. The proposed converter uses a new zero voltage and zero current switching (ZVZCS) strategies to get ZVZCS function. Besides operating at constant frequency, all semiconductor devices operate at soft-switching without additional voltage and current stresses. In order to validate the proposed converter, computer simulations and experimental results were conducted. The paper indicates the effective... Topics: ZVZCS, resonant, converter, semiconductor, current switching, snubber
The phase frequency detector has been designed for high frequency phase locked loop in 180 nm CMOS Technology with 1.8V supply voltage using CADENCE Spectre tool. A Virtuoso Analog Design Environment and Virtuoso LayoutXL tools of Cadence have used to design and simulate schematic and layout of phase frequency detector respectively. Architecture of phase frequency detector (PFD) has simulated to get low dead zone and low power consumption. A layout has designed by above tool and DRC by Assura.... Topics: Phase locked loop (PLL), Phase frequency detector (PFD), Charge pump (CP), Voltage controlled...
Data mining helps to find predictive information from large databases. Companies use predictive modeling tools for strategic decision-making. It helps companies to identify and account for the key assumptions that drive business value—enabling good decision making that leads to predictable results. By analyzing the company’s historical information we can anticipate these changes. This paper aims at providing a proposed data mining solution that can be used for automotive market, especially... Topics: Data Mining, Predictive Modeling, Linear regression Analysis, WEKA
Nowadays high strength and high performance concrete are widely used in many civil engineering constructions. To produce them it is required to reduce the water/powder ratio and increase the binder content. Superplasticizers are commonly used to achieve the workability. Silica fume is one of the popular pozzolanas used in concrete to get imporved properties. The use of silica fume in conjuction with superplastisizers has become the backbone of high strength and high performance concrete. An... Topics: high strength concrete, high performance concrete, superplastcizer, silica fumeI.
This paper proposes a genetic algorithm optimization technique for optimal placement of distributed generation in a radial distribution system to minimize the total power loss and to improve the voltage sag performance. Load flow algorithm and three phase short circuit analysis are combined appropriately with GA, till access to acceptable results of this operation. The suggested method is programmed under MATLAB software. The implementation of the algorithm is illustrated on a 34-node radial... Topics: Distributed Generation, Line Loss, Voltage Sag, Genetic Algorithm, and Radial Distribution network
Software metrics is applied evaluating and assuring software code quality, it requires a model to convert internal quality attributes to code reliability. High degree of complexity in a component (function, subroutine, object, class etc.) is bad in comparison to a low degree of complexity in a component. Various internal codes attribute which can be used to indirectly assess code quality. In this paper, we analyze the software complexity measures for regression testing which enables the... Topics: Software Complexity, Software Metrics, Regression Testing, Control Flow Metrics1
The conventional line commutated ac-to-dc converters/ inverters have square-shaped line current which contains higher-order harmonics. Moreover, it requires a costly and bulky dc inductor or choke. The line current with the high harmonic contents generates EMI and therefore it causes more heating of the core of distribution or power transformers. Alternatively, PWM based inverters using MOSFET/IGBT switches can be used for the above purpose. However, apart from higher switching losses, the... Topics: grid connected inverter, total harmonic distortion (THD), simulink, line current
In this paper we introduce a method for part-ofspeech disambiguation of Persian texts, which uses word class probabilities in a relatively small training corpus in order to automatically tag unrestricted Persian texts. The experiment has been carried out in two levels as unigram and bi-gram genotypes disambiguation. Comparing the results gained from the two levels, we show that using immediate right context to which a given word belongs can increase the accuracy rate of the system to a high... Topics: genotype, machine translation, part of speech disambiguation, word class probabilities
Modern Enterprise Software Systems (MESS) is all about envisioning, developing, managing and evolving enterprise applications to fulfill business requirements. This may entail many challenges like rapidly changing business scenario, increase in complexity, shorter time to market and business agility. In order to deal with this natural evolution, achieving modularity across MESS is essential. In this paper, we describe by way of an example application, some of the common problems encountered... Topic: Enterprise Software
Variable frequency transformer (VFT) is used as a controllable bidirectional transmission device that can transfer power between asynchronous networks and functionally is similar to back-to-back HVDC. This paper describes the basic concept of a New Model Variable Frequency Transformer (NMVFT). NMVFT is a new technology which is used for v/f control of induction motors. A digital simulation model of NMVFT and its control system are developed using MATLAB. The out power thus generated in v/f... Topics: Variable frequency transformer (VFT), Asynchronous, New Model Variable Frequency Transformer...
byFeras Ahmad Hanandeh and Majdi Yousef Al-Shannag
This paper presents a simplified form of UML state diagrams for modeling agent mobility. Mobile agent has gained more importance technology. The notations used to model agent mobility are focused on capturing agent creation, mobility paths and current agent location. In this paper, we demonstrate how the simplification of the state UML 2.0 Activity Diagrams can be used for modeling mobile agent applications. The paper concludes with the appropriateness of the presented approach for modeling... Topics: UML State Diagrams, Agent Mobility, UML Sequence Diagrams
Spectrum analysis is very essential requirement in instrumentation and communication signal interception .Spectrum analysis is normally carried out by online or offline FFT processing. But the FFT being highly mathematical intensive, is not suitable for low area and low power applications. Offline FFT processing can’t give the real time spectrum estimation which is essential in communication signal interception. Online FFT computation takes very high resources, which makes the system costly... Topics: FFT, Goertzel algorithm, Spectrum Analysis, VHDL, XilinX ISE, Modelsim, Spartan 3E-FPGA board.
These paper presents the dynamic operation of a novel control scheme for Static Synchronous Compensator (STATCOM) based on a new full model comprising a 48-pulse Gate Turn-Off (GTO) thyristor voltage source converter for combined reactive power compensation and voltage stabilization of the electric grid network. The novel controller for the STATCOM presented in this paper is based on a decoupled strategy using the direct and quadrature components of the STATCOM current. The complete digital... Topics: 48-pulse GTO thyristor model STATCOM, novel decoupled control strategy, reactive compensation,...
byK.Vivekanandan1 , S.Neelavathi, S.Subhashree, G.Kavitha, and S.Kavitha
The concept of dynamic composition of Web services has been given major importance in the recent years. While there are many systems available to select the services with the highest QoS score, very little thought has been given to the fact of constructing a model which takes in the user’s rating of a service as a major input for selection. A robust system for fetching the most updated version of the selected services and selection of the services based on users’ ratings of the QoS values... Topics: Web Service selection, rating, updated services, aging factor
In this paper, a novel technique is applied to detect fault in the transmission line using wavelet transform. Three phase currents are monitored at both ends of the transmission line using global positioning system synchronizing clock. Wavelet transform, which is very fast and sensitive to noise, is used to extract transients in the line currents for fault detection. Fault index is calculated based on the sum of local and remote end detail coefficients and compared with threshold value to... Topics: Wavelet transform, transmission line faults, power system protection, fault transients,...
In this paper, two different Wavelet based Image Compression techniques are compared. The techniques involved in the comparison process are WDR and ASWDR. The above two techniques are implemented with different types of wavelet codecs. Wavelet difference reduction (WDR) has recently been proposed as a method for efficient embedded image coding. This method retains all of the important features like low complexity, region of interest, embeddedness, and progressive SNR. ASWDR adapts the scanning... Topics: Wavelet Image Compression, WDR, ASWDR
This paper gives an overview and analyzes the different existing anti spamming techniques both content based, non content based methods and a combination of the duo. It also suggests that a small change in one of the parameters in the fuzzy string matching method could be useful to produce better results. Topics: email, spam, computer forensics, fuzzy string match
Neural network based systems have been used in past years for robot navigation applications because of their ability to learn human expertise and to utilize this knowledge to develop autonomous navigation strategies. In this paper, neural based systems are developed for mobile robot reactive navigation. The proposed systems transform sensors’ input to yield wheel velocities. Novel algorithm is proposed for optimal training of neural network. With a view to ascertain the efficacy of proposed... Topics: Mobile robot, Reactive navigation, Neural Network, Optimal learning, Supervised learning
Static Synchronous Series Compensator (SSSC) has been designed with Superconducting Magnetic Energy Storage (SMES) system. A closed loop control scheme has been proposed with PI controller and real and reactive powers are taken as references. A 48 pulse voltage source inverter is designed for the SSSC. Control scheme for the chopper circuit of SMES coil is also designed. A three area system is taken as the test system and the operation of SSSC with SMES is analysed for various transient... Topics: SSSC, SMES, Transient stability, voltage source inverter, closed loop control
This paper investigates the problem of dynamic multiuser subchannel allocation in the downlink OFDM systems. In traditional TDMA or FDMA systems, resource allocation for each user is non-adaptively fixed. Since the subchannel allocations among the users are not optimized, a group of users is likely to suffer from poor channel gains resulting from large path loss and random fading. To resolve this problem a low-complexity adaptive subchannel allocation algorithm is proposed in this paper. By... Topics: OFDM, Sub-Channel, Multiuser, Variable Data Rate.
This work is about the analysis of dead time variation on switching losses in a Zero Voltage Switching (ZVS) synchronous buck converter (SBC) circuit. In high frequency converter circuits, switching losses are commonly linked with high and low side switches of SBC circuit. They are activated externally by the gate driver circuit. The duty ratio, dead time and resonant inductor are the parameters that affect the efficiency of the circuit. These variables can be adjusted for the optimization... Topics: PSpice Simulation, Resonant Gate Driver, Synchronous Buck Converter, Switching Losses
In processes of the production chain of carbide inserts, such as unloading or packaging, the conformity test of the insert type is performed manually, which causes a statistic increase of errors due to monotony and fatigue of workers as well as the wide variety of insert types. A measuring method is introduced that automatically inspects the chipformer geometry, the most significant quality feature of inserts. The proposed recognition approach is based on local energy model of feature... Topics: optical measurement, industrial image processing, testing and inspection, local energy, phase...
This paper presents the speed control of a separately excited DC motor using Fuzzy Logic Control (FLC). The Fuzzy Logic Controller designed in this study applies the required control voltage based on motor speed error (e) and its change (ce). The performance of the driver system was evaluated through digital simulations using Simulink. The simulation results show that the control with FLC outperforms PI control in terms of overshoot, steady state error and rise time. Topics: DC motor, chopper, FLC.
Variable Frequency Transformer (VFT) is a controllable bi-directional transmission device that can transfer power between asynchronous networks. It avoids both HVDC link and FACTS based power transmission control system. Basically, it is a rotatory transformer whose torque is adjusted in order to control the power flow. In this paper, a simulated model of VFT is used as a controllable bidirectional power transmission device that can control power flow through the connected asynchronous power... Topics: Variable frequency transformer (VFT), MATLAB, Asynchronous power systems, Power flow.
The application of particle swarm optimization (PSO) to programming of pavement maintenance activities at the network level is demonstrated. The application of the PSO technique and its relevance to solve the programming problem in a pavement management system (PMS) are discussed. The robust and quick search capability of PSO enable it to effectively handle the highly constrained problem of pavement management activities programming, which has an extremely large solution space of astronomical... Topics: Particle Swarm Optimization, Pavement Management System, Optimization
Humans are able to process a face in a variety of ways to categorize it by its identity, along with a number of other demographic characteristics, including race, gender , and age. Experimental results are based on a face database containing subjects. Race and gender also play an important role in face-related applications. Experimental results are indicated that participants categorized the race of the face and this categorization drives the perceptual process. A face image data set is... Topics: race identification, PCA, face recognition
We present in this paper a very fine method for determining the location of a ground based target when viewed from an Unmanned Aerial Vehicle (UAV). By determining the pixel coordinates on the video frame and by using a range finder the target’s geo-location is determined in the North- East-Down (NED) frame. The contribution of this method is that the target can be localized to within 9m when view from an altitude of 2500m and down to 1m from an altitude of 100m. This method offers a highly... Topic: UAV Applications
In this paper with the help of Matlab/Simulink and dSPACE, the Switch-Mode DC Converter is built in real-time to control the output voltage of the controller using PWM algorithm. First, the Simulink model of Switch-Mode DC Converter (i.e. Single-Pole and Two-Pole Converter Model) is built and, after verifying the results, it is implemented in real-time. Next, a DC motor is connected to the output terminals (i.e. Phase A1 and Phase B1) of the Power Electronics Board such that a variable voltage... Topics: Single-pole, Two-pole, dSPACE
ultralow power consumption requirement of low throughput applications needs to operate circuits in subthreshold region where subthreshold leakage current is used as active current for necessary computations. This paper investigates the impact of interconnect drivers on digital circuit performance in subthreshold region. In particular, we have investigates the performance of Si-MOSFET and CNFETs at 32nm deep submicron technology node. Performance Analysis is carried out for different... Topics: Subthreshold, Ultra-low power, CNFET, Monte- Carlo analysis.
Power electronics systems are non-linear systems, which consume more reactive power and also the loads they feed are mostly inductive loads which leads to a poor power factor. Various compensation techniques are available to bring the power factor nearer to unity. In this paper, a novel compensator is proposed, where in-phase and quadrature components of the supply current are vector-controlled. Implementation of this compensator in a power electronic system operating with a very poor power... Topics: Total Harmonic Distortion, Vector Control, Compensator, Switching, Power Electronic Converters
In this paper we present 1D and 2D systolic Distributed Arithmetic (DA) based structures that are designed for the implementation of Finite Impulse Response (FIR) filters. The paper compares the 1D DA based systolic structure with 1D systolic DA based decomposition method. The filters are implemented on a Xilinx Virtex II Pro (XC2VP30) FPGA using HDL and system metrics like Area, Gate Count, Maximum Usable Frequency and Power consumption are estimated for different filter orders and address... Topics: Distributed arithmetic (DA), Field Programmable Gate Arrays (FPGA), Finite Impulse Response (FIR)...
Harmonic Elimination in a multilevel inverters is an optimization problem which is solved by applying particle swarm optimization (PSO) technique. The derived equation for the computation of total harmonic distortion (THD) of the output voltage of the multilevel inverter is used as the objective function in PSO algorithm. The objective function used is to reduce the THD of the multilevel inverter and obtain the corresponding switching angles with the elimination of possible lower order... Topics: selective harmonic elimination(SHE), particle swarm optimization(PSO), Total harmonic...
Organic Field-Effect Transistors, OFETs, attract much interest recently and their proficiency and hence applications are being enhanced increasingly. However, only analytical model of old field-effect transistors, developed for silicon-based transistors, and their relevant numerical analyses have been used for such devices, so far. Increasing precision of such models and numerical methods are essential now in order to modify OFETs and propose more effective models and methods. This study pegs... Topics: Organic Field-Effect Transistors, IEEE1620, Pentacene, ATLAS (Silvaco) simulator
When the flows in natural or man made channel sections exceed the main channel depth, the adjoining floodplains become inundated and carry part of the river discharge. Due to different hydraulic conditions prevailing in the river and floodplain of a compound channel, the mean velocity in the main channel and in the floodplain are different. This leads to the transfer of momentum between the main channel water and that of the floodplain making the flow structure more complex. Results of some... Topics: Over bank Flow, flow interaction, horizontal interface, Flow distribution, Velocity distribution,...
There is often a requirement to fabricate thin glass plates for prototyping purposes in a research lab. For example to make a prototype of an optic filter there is a need to fabricate a number of thin glass plates and in most moderately equipped optic research laboratory there is facility to etch these glass plates, but lacks instruments to measure its thickness. Our main purpose is to design a system which is cost friendly and is capable of measuring the thickness with a resolution lesser than... Topics: Thickness, Measurement, Electronic System, Optic Device, Michelson Interferometer
byProf. Hapse Manik M., Dr. A.G. Thosar, Prof. Sanjay M. Shinde and Prof. Satish A. Markad
This paper analyzes the probability distribution of wind speed data recorded by Maharashtra Energy Development Agency (MEDA) wind farm at Ahmednagar (India). The main objective is to validate the wind energy probability by using probability distribution function (PDF) of available wind potential. The wind speed is measured with the help of three anemometers S30, S45, S60 placed at 30 m, 45 m, and 60 m height. Mean values are recorded and stored for every hour using a Data logger. For accounting... Topics: probability distribution function, weibull distribution, maximum likelihood, lognormal...
byHarish Kumar, Piyush Kumar and Kaushal Kumar,Venkat babu G
In this paper a proposed of design and analysis of Finite impulse response filter using Hyperbolic Cosine window (Cosh window for short). This window is very useful for some applications such as beam forming, filter design, and speech processing. Digital FIR filter designed by Kaiser window has a better far-end stop-band attenuation than filter designed by the other previously well known adjustable windows such as Dolph-Chebyshev and Saramaki, which are special cases of Ultraspherical windows,... Topics: Digital FIR filter, far-end stopband attenuation, side-lobe roll-off ratio, window technique,...
In the recent technology advances, an increasing number of users are accessing various information systems via wireless communication. The majority users in a mobile environment are moving and accessing wireless services for the activities they are currently unavailable inside. We propose the idea of complex activity for characterizing the continuously changing complex behavior patterns of mobile users. For the purpose of data management, a complex activity is copy as a sequence of location... Topics: Activity mining, Prefectching, pushing, proactive data management, Genetic Algorithm
The sensor nodes in a wireless sensor network are normally microcontroller based which are having limited computational capability related to various applications. This paper describes the selection, specification and realization of a wireless sensor node using the field programmable gate array (FPGA) based architecture for an early detection of hazards (e.g fire and gas-leak ) in mines area. The FPGAs in it’s place are more efficient for complex computations in compare to microcontrollers,... Topics: Wireless Sensor Network (WSN), system on programmable chip (SOPC), FPGA
DBNorma  is a semi automated database normalization tool, which uses a singly linked list to store a relation and functional dependencies hold on it. This paper describes possible algorithms that can be used to normalize a given relation represented using singly linked list. These algorithms are tested on various relational schemas collected from several research papers/resources and output validated. We have also determined the time required to normalize a given relation in 2NF and 3NF and... Topics: Relation, functional dependency, normalization, normal forms.
A conventional motorized wheelchair has been fitted with sensors and programmed with an intelligent guidance system to efficiently maneuver itself automatically from one point to another in a facility equipped with a grid of sensors that provide the wheelchair with the basic map of its course. The device described in this paper has been conceptualized such that once the wheelchair is given information regarding the starting and stopping point in a controlled facility, the wheelchair with this... Topics: wheelchair, automatic, motorized, sensor aided, path finding
Using the Mel-frequency cepstral coefficients (MFCC), Human Factor cepstral coefficients (HFCC) and their new parameters derived from log dynamic spectrum and dynamic log spectrum, these features are widely used for speech recognition in various applications. But, speech recognition systems based on these features do not perform efficiently in the noisy conditions, mobile environment and for speech variation between users of different genders and ages. To maximize the recognition rate of... Topics: MFCC, HFCC, HMM, HOAP-2
A novel example-based process for automated colorization of grayscale images using texture descriptors (ACTD) without any human intervention is proposed. By analyzing a set of sample color images, coherent regions of homogeneous textures are extracted. A multi-channel filtering technique is used for texture-based image segmentation. For each area of interest, state of the art texture descriptors are then computed and stored, along with corresponding color information. These texture descriptors... Topics: Image colorization, Fuzzy C-means clustering, Gabor transform, CBIR
Distributed databases have become the most essential technology for recent business organizations. In most of the cases Distributed Databases are developed in a Bottom- Up approach, fragmentation exists beforehand. The optimum allocation of those fragments is the only way, which can be exploited by the designers to increase the performance, efficiency, reliability and availability of the Distributed Database in the realistic dynamic environment, where the access probabilities of nodes to... Topics: Distributed Database, Fragmentation, Dynamic Fragment Allocation, Distributed Transaction, Local...
Devices such as power electronics converters, inject harmonic currents in the AC system and increase overall reactive power demanded by the equivalent loads are presents non-linear characteristics. Also, the number of sensitive loads that require ideal sinusoidal supply voltages for their proper operation has increased. In order to keep power quality under limits proposed by standards, it is necessary to include some sort of compensation. The aim of this paper is to present a unified power... Topics: unified power quality conditioner, fuzzy logic controller, powewr quality, dc link voltage
The objective of this work is to propose an image denoising technique and compare it with image denoising using ridgelets. The proposed method uses slantlet transform instead of wavelets in ridgelet transform. Experimental result shows that the proposed method is more effective than ridgelets in noise removal. The proposed method is effective in compressing images while preserving edges. Topics: ridgelet, slantlet transform, image denoising, compression, huffman, edge
One of the challenging issues in Spread-Spectrum Modulation (SSM) is the design of the Pseudo - Random or Pseudo - Noise (PN) sequence generator as an option to the already available methods. This work is related to the use of Artificial Neural Network (ANN) for generation of the PN sequence during transmission and reception of a SSM based system. The benefit of the ANN - assisted PN generator shall be that it will simplify the design process of the PN - generator and yet provide high... Topics: SSM, PN sequence, ANN, Rayleigh, Rician